error: unused variable: `unused`
  --> $DIR/lint-removed-allow.rs:18:17
   |
LL | fn main() { let unused = (); } //~ ERROR unused
   |                 ^^^^^^ help: consider using `_unused` instead
   |
note: lint level defined here
  --> $DIR/lint-removed-allow.rs:17:8
   |
LL | #[deny(unused_variables)]
   |        ^^^^^^^^^^^^^^^^

error: aborting due to previous error